Florida Agricultural Experiment Station


 CORN WEEVILS (Calandra oryzae and C. granaria)
 Sweet, or field corn, which is stored, is subject to attack by
 these small beetles (fig. 85) which eat the interior of the ker-
 nels. As soon as weevils are noticed, the corn should be fumi-
 gated with carbon bisul-
 phide, using 2 or 3 pounds
 to 1000 cubic feet of
 space in the bin or crib.
 The material is placed in
 an open dish on top of
 the corn and allowed to
 evaporate. The fumes b
 are heavier than air and
 will sink, and penetrated
 the corn. The bin should
 be made perfectly tight
 before the sulphide is in-
 troduced, and kept closed
 afterward for at least 24
 hours. All fire and lights, FIG. 85.-Calandra granaria: a, Adult; b,
 including lighted pipes, larva; c, pupa; d, Calandra oryzae. About
 seven times natural size. (From U. S.
should be kept away for Bur. of Ent.)
the fumes are inflam-
mable. A safer fumigant is paradichlorobenzene. It is not inflam-
mable and is not as dangerous to human beings who breathe its
fumes. It is a new material on the market and some difficulty
may be met in obtaining it. To use, dissolve in water 12
ounces for each 100 cubic feet of space. The liquid is then
soaked up in a rag which is placed in the seed box. There is
less danger of injuring the germinating ability of the corn by
an overdose with this fumigant than with carbon bisulphide.
Even live animals, such as dogs, cats, and chickens, can be thus
fumigated safely in a box for an hour. Either of these insecti-
cides is more effective when the temperature is above 60 degrees.

 OTHER CORN PESTS
 Other insects attacking corn are: Sweet-potato caterpillar
 (see under sweet potatoes, page 186), and serpentine leaf-miner
 (see under cowpeas, page 162). The bean-jassid (see bean leaf-
 hopper, page 129), lantern-fly, (see page 203), and the lesser
 corn stalk-borer (see under beans, page 132) are particularly
injurious to very late-planted corn and, when the bud worm (see